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Master Limited Partnership (Tables)
 6 Months Ended
Jun. 30, 2025
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
Three Months Ended 
June 30,		Six Months Ended 
June 30,
(In millions, except per share data)2025202420252024
Number of shares repurchased5 15 12 28 
Cash paid for shares repurchased(a)
$692 $2,896 $1,749 $5,114 
Average cost per share(b)
$146.43 $185.34 $147.29 $177.54 
(a)    2025 excludes $88 million paid in 2025 for excise tax on 2024 share repurchases.
(b)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:
Three Months Ended 
June 30,		Six Months Ended 
June 30,
(Millions of dollars)2025202420252024
Increase (decrease) due to change in ownership$(42)$119 $(3)$227 
Tax impact13 (40)(1)(76)
Increase (decrease) in MPC's additional paid-in capital, net of tax$(29)$79 $(4)$151 
MPLX LP  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
June 30,		Six Months Ended 
June 30,
(In millions, except per unit data)2025202420252024
Number of common units repurchased2 2 4 4 
Cash paid for common units repurchased$100 $75 $200 $150 
Average cost per unit$50.31 $41.10 $51.38 $40.56